On StemtoStern.com, or Mercruiserparts.com, or other parts lookup websites, there is a range of serial numbers from about 0f800000 to 0k999999.
If you were looking at stern drive big blocks, these numbers were identified as ........1996-97 454 Mag MPI (Gen IV)
If you were looking at inboard big blocks, these numbers were identified as .........1996-97 7.4L MIE MPI (Gen IV).
But they are all (stern or inboard) in the same category of numbers.
Do all these engines have rectangle ports and HiPerf cam?
What hp are these engines?
Are they all the same (except for the bellhousing)?
Some people say they are 300HP, some say that they are 385HP.